Speeds are indicative. Measurements may differ by 10% from effective speeds.
What does the graph mean?
The figure shows, in a bar chart, what percentage of the cars and each speed interval fall, for the period you select at the top of the page.
How accurate is this?
We don't know exactly. These figures are not compared to a calibrated speedometer. Theoretically, we expect there to be a limited error for properly functioning windows, if you look at them for a sufficiently large time interval. The speeds are primarily indicative and provide a good basis for comparison with other streets.
According to my Telraam, cars drive faster than 70km/h in my street, but that's not possible physically. Is my Telraam not working?
Yes, but there are so-called outliers; measurements in which something has gone wrong. We don't filter for these errors. If you suspect that there is a problem with the speed measurements, report it to the Telraam-Team.
Is my Telraam a speed camera after all?
No, certainly not. Your Telraam cannot make a statement about the (calibrated) speed of individual cars. The measurement error can be large at the level of individual vehicles, but that error can be in both directions (faster or slower than in reality). This error corrects itself at the level of a group of cars, as there are more measurements. Telraam can therefore give you an idea about the speed regime of a large number of cars.